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@article{MZ_1984__185_173416, author = {Donald J. Collins and Zieschang Heiner}, title = {Rescuing the {Whitehead} {Method} for {Free} {Products,} {I:} {Peak} {Reduction.}}, journal = {Mathematische Zeitschrift}, pages = {487--504}, publisher = {mathdoc}, volume = {185}, year = {1984}, zbl = {0537.20010}, url = {http://geodesic.mathdoc.fr/item/MZ_1984__185_173416/} }
Donald J. Collins; Zieschang Heiner. Rescuing the Whitehead Method for Free Products, I: Peak Reduction.. Mathematische Zeitschrift, Tome 185 (1984), pp. 487-504. http://geodesic.mathdoc.fr/item/MZ_1984__185_173416/